How to add Haptic Feedback to Your Pedals for Your Sim Rig Using SimHub under $30 

For sure a must!

So the arduino uno board is connected to USB and that powers it, then the Motor driver board needs to be plugged onto a power source with the + and - shown in the diagram. I used a 12v power supply i had laying around.

The round plug is for the motor driver board, to power the motors. Then the USB port on the Arduino Uno is to power that board and also transfer data. So you need both cables.

Is this a 9v battery supply or mains supply via the round cable?

@@MegaWolfieWolf Ive got a 12v like this - amzn.to/4dbrA6E